PPT Slide

Axial versus spiral

• same mAs / revolution

• same table distance per tube rotation (pf = 1, pitch = 1)

same number of revolutions^

effect on dose

average organ dose = same

DLP = same

effective dose = ~ same

L

L

axial

spiral

same collimated slice, same imaged length

^extra half or one revolution at either end to allow for interpolation

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